Adjustable timing apparatus for electric ignition systems.



A. ZKHRINGER. ADJUSTABLE TIMING APPARATUS FOR ELECTRIC IGNITION SYSTEMS. APPLICATION FILED AUG. 1, 1912.

1,079,532. Patented Nov. 25, 1913.

J W W/ various UNITED STATES PATENT OFFICE.

ARNOLD LAHRINGER, 0F STUTTGART, GERMANY, ASSIGNOR TO. THE FIRM 01 ROBERT BOSCH, OF STUTTGART, GERMANY.

ADJUSTABLE TIMING APPARATUS FOR, ELECTRIC IGNITION SYSTEMS.

Specification of Letters Patent.

Patented Nov. 25, 1913.

Application filed August 1, 1912. Serial No. 712,638.

To all whom it may concern:

Be it known that I, ARNOLD ZAHRINGER, a subject of the Emperor of Germany, residing at 11-13 Hoppenlaustrasse, Stuttgart, Germany, have invented certain new and useful Improvements in Adjustable Timing Apparatus for Electric Ignition Systems; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

The present invention relates to adjustable timing apparatus for electrical ignition systems, and more particularly to an adjustable connection between the timing lever and the cam ring of a mechanical interrupter for an ignition current generator, whereby the point of connection between the lever and the ring may be selected to suit arrangements of the generator and the actuating devices on the various types of automobiles, for instance, and whereby the point .of connection may be readily changed at will.

Heretofore, the timing lever was screwed, soldered, riveted, or otherwise permanently fastened to thecam ring, and it has been the practice to cut the cams at predetermined points on the ring, after careful measurement, for each individual type of actuating devices.

The present invention makes it possible to standardize the output of cam rings, regardless'of the particular type of automobile or the like, with which the rings are to be used, by providing an adjustable connection between the timing lever and the cam ring, together with clamping or other suitable means for securely fastenin the parts together at any or various places to .which the may be adjusted.

ith this construction the point of connection may be changed merely by loosening the clamping or similar device, then ad ustin the parts to their new position, and 'fina ly locking them together at the adjusted place.

In the accompanying drawings illustrating the preferred embodiment o my invention, Figure 1 represents a vertical sectionof the cam ring; Fig. 2 represents a plan screw e is loose,

edges. The ledge 6 extends but partly around the cam ring so as to make provision for a distributer (not shown) which may extend to the place of interruption of the ledge at the top of Fig. 2. The timing le- Ver 0 is slotted at s in the socket d, and is provided with a grooved end adapted to embrace the ledge in such manner as to permit sliding of the lever around the led e without disengagement of the parts. To fasten the timing lever c in any adjusted place on the cam ring a, the screw 6 is tightened, whereupon the parts of the socket of above and below the slot 8 are brought together until the ledge b is tightly engaged. The timing lever may be adjusted to any position on the cam ring by unloosening the screw e, then moving the timing lever to the desired new positioncn the cam ring, and then finally tightening the screw e. The socket (Z may be placed in engagement with the ledge by sliding it thereon from the place of interruption at the top of Fig. 2. However, it will be apparent that the socket may be constructed so as to pass laterally over the outer edges of the ledge b when the and the ledge may extend completely around the cam ring, if desired.

In order to more effectively secure the timing lever in position on the cam ring a plurality of'circumterentially spaced recesses f may be formed in the ledge b as shown, into which fits the head of thescrcw e.

Having thus described my invention, what I claim is:

1. In an adjustable timing apparatus for electrical ignition systems, a cam ring having a circumferential ledge, a timing lever having a socket adapted to loosely engage said ledge, and a clamping screw for drawing up the socket to securely tighten it on the ledge at any point to which the timing lever may be adjusted.

2. In an adjustable timing apparatus for curely lock the time lever in place on the electrical ignition systems, a cam ring havcam ring. 16 ing a circumferential ledge and a plurality In testimony whereof I afiix my signature,

of circumferentially sgaced recesses, a tim-f in presence of two witnesses.

ing lever havin a soc et adapted to loosely ARNOLD Z 'A' HRINGER engage said 1e ge, and a clamping screw Wi adapted to fasten the socket to the ledge and BEINHOLD E to fit within any one of said recesses to se- P W 

